When i go to clean my lines and pull water in lines first is it safe to sell 2 pints of each pump and sell, before the water comes through some people i ask say yes ?
Provided you are absolutely sure you are flushing with fresh water before using beer line cleaner then it is safe. You have a duty of care to your customers to provide them with a good unadulterated product. There might be a remote possibility that you could serve your customers beer contaminated with water, which would not be good for the customer or your pubs reputation. There are cleaning machines available that through an automated process allow you to sell beer that is pulled off. Given the choice and at the cost of losing a few pints I would not bother with this practice.